The decomposition of H₂O₂(aq) was monitored under the four conditions listed below.
Run | [H₂O₂]₀ (mol L⁻¹) | Temperature (°C) | MnO₂ catalyst?
1 | 0.50 | 20 | No
2 | 0.50 | 20 | Yes
3 | 0.50 | 30 | No
4 | 1.00 | 20 | No
(a) Rank the initial reaction rates for Runs 1–4 from fastest to slowest.
(b) Identify the two runs that you would expect to have the most similar initial rates and explain why.